Sagittarius Mines Inc. (SMI)/Xstrata Copper (XCu) retained Klohn Crippen Berger Ltd. (KCB) to provide conceptual level closure designs for the Tailings Storage Facility (TSF), Fresh Water Dam (FWD) and Waste Rock Storage Facility (WRSF) for the proposed Tampakan Copper-Gold mine in Mindanao, southern Philippines. These conceptual closure designs were also incorporated into the overall Environment and Social Impact Assessment (ESIA) report to illustrate safe, long term storage for the tailings and waste rock, and the ability to manage water flow.
The key considerations in the development of the waste management strategy for the project were waste geochemistry and the management of water quality effects. The majority of waste that will be generated through mining is considered to be either potentially acid forming (PAF) or cannot be practically separated from the PAF material.
Conceptual closure strategies were therefore developed for the TSF, FWD and WRSF with special consideration for storage and disposal of the PAF material. The overall objective of the closure strategies was to ensure the waste storage facilities are geotechnical and geochemically stable and do not give rise to unacceptable environmental impact; specifically, the management of waste geochemistry to protect downstream users.
Scope of Services:
- Surface Diversion Design and Long Term Water Management Strategy.
- Erosion and Sediment Control Systems.
- Long Term Chemical Stability of Seepage.
- Post Closure Water Balance.
- Geochemical Characterisation of Waste Material.
- Closure Water Quality Modelling and Prediction.
- Assessment of Environmental Objectives.
- Assessment of Long Term Care and Maintenance of Waste Facilities.